BIG TREE TECH CB1 User manual

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BIGTREETECH
CB1
User Manual

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CONTENTS
CONTENTS .......................................................................2
Revision History ..................................................................3
1. Product Profile .................................................................4
1.1 Feature Highlights ..........................................................4
1.2 Specifications ..............................................................4
1.3 Dimensions ................................................................5
2 Peripheral Port ..................................................................5
2.1 Pin........................................................................5
3. Interface Introduction ..........................................................11
3.1 Install via the BTB Connection ...............................................11
3.2 40 pins GPIO..............................................................12
4. Write OS ......................................................................13
4.1 Download the OS Image ....................................................13
4.2 Download and Install Writing Software ........................................13
4.3 Write OS..................................................................13
4.3.1 For Raspberry Pi Imager ..............................................13
4.3.2 For balenaEtcher ..................................................15
5. Configure Network .............................................................18
5.1 Ethernet ..................................................................18
5.2 WiFi Setting ...............................................................18
6. Configure Motherboard.........................................................19
6.1 SSH Connect to Device with CB1 Installed ....................................19
6.2 Compile MCU Firmware ....................................................20
7. Cautions ......................................................................22

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Revision History
Version
Revisions
Date
01.00
Original
2022/09/20

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1. Product Profile
The BIGTREETECH CB1 is launched to provide a great solution to the insane
shortage of Raspberry Pi CM4. It outputs signals to the motherboard via the fast and
convenient two 100 pins micro BTB connection header, including 100M Ethernet,
HDMI, etc. Also, onboard 2.4G WiFi.
1.1 Feature Highlights
1. CPU: ALLWINNER H616, Quad-core Cortex-A53 @1.5GHz
2. GPU: Mali G31 MP2, Support OpenGL3.2
3. RAM: 512MB/1GB DDR3L SDRAM
4. Display: Compatible with HDMI2.0A Interface, Support 4K Displays
5. Compatible with USB2.0 Interface
6. Support 100M Ethernet + 100M WiFi
7. Having the same BTB header as the Raspberry Pi CM4.
1.2 Specifications
1. Product Size: 40mm x 55mm
2. Mounting Size: 33mm x 48mm
3. Input Voltage: 5V±5%/2A
4. Output Voltage: 3.3V±2%/100mA
5. Output Voltage: 1.8V±2%/100mA
6. WiFi: 2.4G/802.11 b/g/n

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1.3 Dimensions
2 Peripheral Port
2.1 Pin
PIN
Connector
Signal
Description
1
A connector_01
GND
2
A connector_02
GND
3
A connector_03
NC
4
A connector_04
EPHY-TXP
Ethernet TX Positive
5
A connector_05
NC
6
A connector_06
EPHY-TXN
Ethernet TX Negative
7
A connector_07
GND
8
A connector_08
GND
9
A connector_09
NC
10
A connector_10
EPHY-RXP
Ethernet RX Positive
11
A connector_11
NC
12
A connector_12
EPHY-RXN
Ethernet RX Negative
13
A connector_13
GND

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14
A connector_14
GND
15
A connector_15
LINK_LED
Ethernet LED
16
A connector_16
NC
17
A connector_17
SPD_LED
Ethernet LED
18
A connector_18
NC
19
A connector_19
NC
20
A connector_20
NC
21
A connector_21
SYS-LED
System work light
22
A connector_22
GND
23
A connector_23
GND
24
A connector_24
PC15
3.3V IO(CB1 V2.1 is 1.8v )
25
A connector_25
PC8
3.3V IO(CB1 V2.1 is 1.8v )
26
A connector_26
PC6
3.3V IO(CB1 V2.1 is 1.8v )
27
A connector_27
PH10
3.3V IO
28
A connector_28
NC
29
A connector_29
NC
30
A connector_30
PG6
3.3V IO
31
A connector_31
PG9
3.3V IO
32
A connector_32
GND
33
A connector_33
GND
34
A connector_34
NC
35
A connector_35
PG7
3.3V IO
36
A connector_36
NC
37
A connector_37
PG8
3.3V IO
38
A connector_38
PH6
3.3V IO
39
A connector_39
NC
3.3V IO
40
A connector_40
PH8
3.3V IO
41
A connector_41
NC
42
A connector_42
GND
43
A connector_43
GND
44
A connector_44
PH7
3.3V IO
45
A connector_45
PC9
3.3V IO(CB1 V2.1 is 1.8v )
46
A connector_46
PC10
3.3V IO(CB1 V2.1 is 1.8v )
47
A connector_47
PC11
3.3V IO(CB1 V2.1 is 1.8v )
48
A connector_48
PC12
3.3V IO(CB1 V2.1 is 1.8v )
49
A connector_49
PC13
3.3V IO(CB1 V2.1 is 1.8v )
50
A connector_50
PC14
3.3V IO(CB1 V2.1 is 1.8v )
51
A connector_51
SoC_RX
DEBUG UART
52
A connector_52
GND
53
A connector_53
GND
54
A connector_54
PC7
3.3V IO(CB1 V2.1 is 1.8v )
55
A connector_55
SoC_TX
DEBUG UART
56
A connector_56
NC
57
A connector_57
SDC0-CLK
SDCARD Clock signal

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58
A connector_58
NC
59
A connector_59
GND
60
A connector_60
GND
61
A connector_61
SDC0-D3
SDCARD Data3 signal
62
A connector_62
SDC0-CMD
SDCARD CMD signal
63
A connector_63
SDC0-D0
SDCARD Data0 signal
64
A connector_64
PG11
3.3V IO
65
A connector_65
GND
66
A connector_66
GND
67
A connector_67
SDC0-D1
SDCARD Data1 signal
68
A connector_68
PG12
3.3V IO
69
A connector_69
SDC0-D2
SDCARD Data2 signal
70
A connector_70
PG13
3.3V IO
71
A connector_71
GND
72
A connector_72
PG14
3.3V IO
73
A connector_73
PG16
3.3V IO
74
A connector_74
GND
75
A connector_75
NC
76
A connector_76
SDC0-DET
SDCARD detect
77
A connector_77
VCC_5V
5V IN /2A
78
A connector_78
NC
79
A connector_79
VCC_5V
5V IN /2A
80
A connector_80
NC
81
A connector_81
VCC_5V
5V IN /2A
82
A connector_82
NC
83
A connector_83
VCC_5V
5V IN /2A
84
A connector_84
3V3
3.3V out /200mA
85
A connector_85
VCC_5V
5V IN /2A
86
A connector_86
3V3
3.3V out /200mA
87
A connector_87
VCC_5V
5V IN /2A
88
A connector_88
1V8
1.8V out /100mA
89
A connector_89
NC
90
A connector_90
1V8
1.8V out /100mA
91
A connector_91
NC
92
A connector_92
PWRON
Power switch (useless)
93
A connector_93
FEL
(useless)
94
A connector_94
NC
95
A connector_95
NC
96
A connector_96
NC
97
A connector_97
NC
98
A connector_98
GND
99
A connector_99
RECOVERY
Program download (useless)
100
A connector_100
AP-RESET
power reset (useless)
101
B connector_1
NC

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102
B connector_2
NC
103
B connector_3
USB1-DM
HOST USB1
104
B connector_4
LINEOUTL
105
B connector_5
USB1-DP
HOST USB1
106
B connector_6
LINEOUTR
107
B connector_7
GND
108
B connector_8
GND
109
B connector_9
NC
110
B connector_10
NC
111
B connector_11
TV_OUT
CVBS OUT
112
B connector_12
NC
113
B connector_13
GND
114
B connector_14
GND
115
B connector_15
NC
116
B connector_16
NC
117
B connector_17
NC
118
B connector_18
NC
119
B connector_19
GND
120
B connector_20
GND
121
B connector_21
NC
122
B connector_22
NC
123
B connector_23
NC
124
B connector_24
NC
125
B connector_25
GND
126
B connector_26
GND
127
B connector_27
NC
128
B connector_28
USB3-DM
HOST USB3
129
B connector_29
NC
130
B connector_30
USB3-DP
HOST USB3
131
B connector_31
GND
132
B connector_32
GND
133
B connector_33
NC
134
B connector_34
USB2-DM
HOST USB2
135
B connector_35
NC
136
B connector_36
USB2-DP
HOST USB2
137
B connector_37
GND
138
B connector_38
GND
139
B connector_39
NC
140
B connector_40
USB0-DM
OTG USB
141
B connector_41
NC
142
B connector_42
USB0-DP
OTG USB
143
B connector_43
NC
144
B connector_44
GND
145
B connector_45
NC

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146
B connector_46
NC
147
B connector_47
NC
148
B connector_48
NC
149
B connector_49
NC
150
B connector_50
GND
151
B connector_51
HCEC
HDMI CEC
152
B connector_52
NC
153
B connector_53
HHPD
HDMI Hotplug
154
B connector_54
NC
155
B connector_55
GND
156
B connector_56
GND
157
B connector_57
NC
158
B connector_58
NC
159
B connector_59
NC
160
B connector_60
NC
161
B connector_61
GND
162
B connector_62
GND
163
B connector_63
NC
164
B connector_64
NC
165
B connector_65
NC
166
B connector_66
NC
167
B connector_67
GND
168
B connector_68
GND
169
B connector_69
NC
170
B connector_70
HTX2P
HDMI TX2 Positive.
171
B connector_71
NC
172
B connector_72
HTX2N
HDMI TX2 Negative.
173
B connector_73
GND
174
B connector_74
GND
175
B connector_75
NC
176
B connector_76
HTX1P
HDMI TX1 Positive.
177
B connector_77
NC
178
B connector_78
HTX1N
HDMI TX1 Negative.
179
B connector_79
GND
180
B connector_80
GND
181
B connector_81
NC
182
B connector_82
HTX0P
HDMI TX0 Positive.
183
B connector_83
NC
184
B connector_84
HTX0N
HDMI TX0 Negative.
185
B connector_85
GND
186
B connector_86
GND
187
B connector_87
NC
188
B connector_88
HTXCP
HDMI CLK Positive.
189
B connector_89
NC

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190
B connector_90
HTXCN
HDMI CLK Negative.
191
B connector_91
GND
192
B connector_92
GND
193
B connector_93
NC
194
B connector_94
NC
195
B connector_95
NC
196
B connector_96
NC
197
B connector_97
GND
198
B connector_98
GND
199
B connector_99
HSDA
HDMI I2C
200
B connector_100
HSCL
HDMI I2C

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3. Interface Introduction
3.1 Install via the BTB Connection

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3.2 40 pins GPIO
When Manta series motherboard work with CB1, 40 pins GPIO is a custom IO
arrangement, as shown in the figure below, Pin 7 is CB1's "PC7", and Pin 11 is CB1's
"PC14". The GPIO number of CB1 corresponds to (Px–PA)*32 + Pin
For example:
PC7 = (PC–PA)*32 + 7 = 2 * 32 + 7 = 71
PH10 = (PH–PA)*32 + 10 = 7 * 32 + 10 = 234
PC7 is numbered in Klipper as pin: host: gpio71, PH10 as pin: host: gpio234
Note: The logic voltage of PC ports in V2.1 version (PC6, PC7, PC8, PC9, PC10,
PC11, PC12, PC13, PC14, PC15): 1.8V;
The logic voltage of PC ports in V2.2 version (PC6, PC7, PC8, PC9, PC10, PC11,
PC12, PC13, PC14, PC15): 3.3V.

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4. Write OS
4.1 Download the OS Image
Please download and install the OS image we provided:
https://github.com/bigtreetech/CB1/releases
4.2 Download and Install Writing Software
The official Raspberry Pi Imager: https://www.raspberrypi.com/software/
balenaEtcher: https://www.balena.io/etcher/
Both of the above software can be used, just choose one to download and install.
4.3 Write OS
4.3.1 For Raspberry Pi Imager
a. Insert a MicroSD into your computer.
b. Choose OS.

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c. Select "Use custom", then select the image that you downloaded.
d. Select the MicroSD card and click "WRITE" (WRITE the image will format the
MicroSD card. Be careful not to select the wrong storage device, otherwise the
data will be formatted.)

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e. Wait for the writing to finish.
4.3.2 For balenaEtcher
a. Insert a MicroSD card to your computer through a card reader.

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b. Select the image that you downloaded.
c. Select the MicroSD card and click "WRITE" (WRITE the image will format the
MicroSD card. Be careful not to select the wrong storage device, otherwise the
data will be formatted.)
d. Wait for the writing to finish.

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5. Configure Network
5.1 Ethernet
Plug-and-play with an Ethernet cable, no additional setup required.
5.2 WiFi Setting
After successfully writing the OS image, the MicroSD card will have a FAT32 partition
recognized by the computer and a configuration file named "system.cfg" under this
partition.
Open with Notepad, replace WIFI-SSID with your WiFi name, and PASSWORD with
your password.

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6. Configure Motherboard
6.1 SSH Connect to Device with CB1 Installed
1. Install the SSH application Mobaxterm: https://mobaxterm.mobatek.net/download-
home-edition.html
2. Insert the MicroSD card to the motherboard, and wait for the system to load after
power on, approx. 1-2 minutes.
3. The device with CB1 installed will automatically be assigned an IP after being
successfully connected to the network.
4. Find the IP address on your router page.
5. Open Mobaxterm and click "Session", and click "SSH", enter the IP you got in step
3 into Remote host, and click "OK". (Note: your computer and the printer needs to
be in the same network.)

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6. Login as: biqu, password: biqu.
6.2 Compile MCU Firmware
1. After SSH is successfully connected to the device with CB1 installed, enter in the
terminal:
cd ~/klipper/
make menuconfig
Compile the firmware with the corresponding motherboard configuration, here is
the Manta M4P example:
* [*] Enable extra low-level configuration options
* Micro-controller Architecture (STMicroelectronics STM32) --->
* Processor model (STM32G0B1) --->
* Bootloader offset (8KiB bootloader) --->
* Clock Reference (8 MHz crystal) --->
* Communication interface (USB (on PA11/PA12)) --->